[Bug debugedit/31653] RISC-V: readelf fails to apply R_RISCV_SET/SUB_ULEB128 relocations: [debugedit 5.0] testsuite: 10 11 19 23 failed

[laokz at foxmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31653

--- Comment #4 from laokz <laokz at foxmail dot com> ---
(In reply to Mark Wielaard from comment #3)
> (In reply to laokz from comment #2)
> > When compiled the tests, we added -O2 option. Without -O2, all tests passed
> > and no R_RISCV_SET/SUB_ULEB128 generated. It seems that gcc/binutils do
> > support generating these relocs but readelf doesn't support applying them
> > yet.
> 
> How exactly do you add the -O2 option?
>
We work for openEuler Linux. It uses gcc_secure[1], which is a wrapper of gcc,
to optimize and enhance security. Gcc_secure added the -O2 option.

> > Reproduce steps:
> > 0. platform: openSUSE Tumbleweed 20241029 - Kernel 6.11.5-1-default, riscv
> > qemu vm, gcc-14.2.1, binutils-2.43.1.20240828-2
> > 1. echo "int main(){}" >z.c
> > 2. gcc -g -O2 z.c
> 
> plus -c
> 
Oops

> > 3. readelf -Wr z.o|grep 128                                                 
> 
> So this "reproduces" the warnings.
> 
> But I cannot replicate using the debugedit build/tests.
> Is there a special way you are configuring/building and/or running make
> check?
> 
> If you are editing debugedit.at to explicitly add -O2 then please just don't
> do that.

No. 

We could avoid the problem by adding debugedit to gcc_secure exclusive list, or
by other means. Thanks for your reply.

[1] https://gitee.com/src-openeuler/gcc_secure

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